Heterosis And Combining Ability Studies In Bread Wheat(Triticum Aestivum L.em Thell)
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Date
1993
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Birsa Agricultural University, Ranchi
Abstract
Ten genotypes of bread wheat (Triticum aestivum L. em. Thell) namely, HUW 206, HUW 234, HW 2001, HW 2002, KS 19, KS 26, KS 34, UP 262, HD 2385 and HD 2402 were crossed in a diallel fashion excluding reciprocals. The fortyfive crosses and ten parents were grown in a randomised complete block design during Rabi season of 1988-89 under normal sown irrigated condition, The data recorded on twelve quantitative characters viz., plant height, ear length, number of earheads per plant, number of grains per ear, 100-grain weight, flag leaf area, peduncle length, sheath length, grain filling period, biological yield per plant, grain yield per plant and harvest index were analysed to find out the estimates of variability, heritability (broad sense), genetic advance, heterosis (over mid-parent, better parent and over UP 262), combining ability and character association.
The analysis of variance revealed highly significant differences among the genotypes for all the twelve characters except for number of earheads per plant which was significant at 5 per cent level both for parents and crosses. This indicated the inherent genetic differences among parents as well as crosses for all the characters under the present investigation.
Grain yield per plant, number of grains per ear, flag leaf area and biological yield per plant showed consi derable genetic coefficient of variation.